Techniques for resource allocation in an integrated access and backhaul (IAB) system

ABSTRACT

Aspects described herein relate to resource allocation in an integrated access and backhaul (IAB) system. In an example, the aspects include receiving, by a wireless node, an indication of not-available (NA) resources of a parent node, the NA resources corresponding to a first set of one or more resources configured at the parent node as being unavailable for uplink and downlink communications between the parent node and the wireless node, wherein the indication of NA resources of the parent node comprises an invalid time division duplex (TDD)-uplink-downlink configuration; and refraining, by the wireless node, from communicating with the parent node within the NA resources based on the indication of NA resources of the parent node.

CROSS-REFERENCE TO RELATED APPLICATION(S)

The present application claims benefit of U.S. Provisional ApplicationNo. 62/976,928 entitled “TECHNIQUES FOR RESOURCE ALLOCATION IN ANINTEGRATED ACCESS AND BACKHAUL (IAB) SYSTEM” filed Feb. 14, 2020, whichis assigned to the assignee hereof and hereby expressly incorporated byreference herein.

BACKGROUND

Aspects of the present disclosure relate generally to wirelesscommunication systems, and more particularly, to resource allocation inan integrated access and backhaul (IAB) system.

Wireless communication systems are widely deployed to provide varioustypes of communication content such as voice, video, packet data,messaging, broadcast, and so on. These systems may be multiple-accesssystems capable of supporting communication with multiple users bysharing the available system resources (e.g., time, frequency, andpower). Examples of such multiple-access systems include code-divisionmultiple access (CDMA) systems, time-division multiple access (TDMA)systems, frequency-division multiple access (FDMA) systems, andorthogonal frequency-division multiple access (OFDMA) systems, andsingle-carrier frequency division multiple access (SC-FDMA) systems.

These multiple access technologies have been adopted in varioustelecommunication standards to provide a common protocol that enablesdifferent wireless devices to communicate on a municipal, national,regional, and even global level. For example, a fifth generation (5G)wireless communications technology (which can be referred to as NR) isenvisaged to expand and support diverse usage scenarios and applicationswith respect to current mobile network generations. In an aspect, 5Gcommunications technology can include: enhanced mobile broadbandaddressing human-centric use cases for access to multimedia content,services and data; ultra-reliable-low latency communications (URLLC)with certain specifications for latency and reliability; and massivemachine type communications, which can allow a very large number ofconnected devices and transmission of a relatively low volume ofnon-delay-sensitive information.

For example, for various communications technology such as, but notlimited to NR, full duplex communication with respect to integratedaccess and backhaul (IAB) implementations may increase transmissionspeed and flexibility but also transmission complexity. Thus,improvements in wireless communication operations may be desired.

SUMMARY

The following presents a simplified summary of one or more aspects inorder to provide a basic understanding of such aspects. This summary isnot an extensive overview of all contemplated aspects, and is intendedto neither identify key or critical elements of all aspects nordelineate the scope of any or all aspects. Its sole purpose is topresent some concepts of one or more aspects in a simplified form as aprelude to the more detailed description that is presented later.

According to an example, a method of wireless communication includingreceiving, by a wireless node, an indication of not-available (NA)resources of a parent node, the NA resources corresponding to a firstset of one or more resources configured at the parent node as beingunavailable for uplink and downlink communications between the parentnode and the wireless node, wherein the indication of NA resources ofthe parent node comprises an invalid time division duplex(TDD)-uplink-downlink configuration; and refraining, by the wirelessnode, from communicating with the parent node within the NA resourcesbased on the indication of NA resources of the parent node.

In a further example, an apparatus for wireless communication isprovided that includes a transceiver, a memory configured to storeinstructions, and one or more processors communicatively coupled withthe transceiver and the memory. The one or more processors areconfigured to execute the instructions to receive, by a wireless node,an indication of NA resources of a parent node, the NA resourcescorresponding to a first set of one or more resources configured at theparent node as being unavailable for uplink and downlink communicationsbetween the parent node and the wireless node, wherein the indication ofNA resources of the parent node comprises an invalid TDD-uplink-downlinkconfiguration; and refrain, by the wireless node, from communicatingwith the parent node within the NA resources based on the indication ofNA resources of the parent node.

In another aspect, an apparatus for wireless communication is providedthat includes means for receiving, by a wireless node, an indication ofNA resources of a parent node, the NA resources corresponding to a firstset of one or more resources configured at the parent node as beingunavailable for uplink and downlink communications between the parentnode and the wireless node, wherein the indication of NA resources ofthe parent node comprises an invalid TDD-uplink-downlink configuration;and means for refraining, by the wireless node, from communicating withthe parent node within the NA resources based on the indication of NAresources of the parent node.

In yet another aspect, a non-transitory computer-readable medium isprovided including code executable by one or more processors to receive,by a wireless node, an indication of NA resources of a parent node, theNA resources corresponding to a first set of one or more resourcesconfigured at the parent node as being unavailable for uplink anddownlink communications between the parent node and the wireless node,wherein the indication of NA resources of the parent node comprises aninvalid TDD-uplink-downlink configuration; and refrain, by the wirelessnode, from communicating with the parent node within the NA resourcesbased on the indication of NA resources of the parent node.

According to another example, a method of wireless communicationincludes determining, by a network node, whether one or more resourcescorrespond to NA resources of the network node, the NA resourcescorresponding to a first set of one or more resources configured at thenetwork node as being unavailable for uplink and downlink communicationsbetween the network node and the wireless node, wherein the indicationof NA resources of the network node comprises an invalidTDD-uplink-downlink configuration; and transmitting, by the network nodeto the wireless node, an indication of NA resources of the network node,wherein the indication is configured to trigger the wireless node torefrain from communication with the network node within the NA resourcesof the network node.

In a further example, an apparatus for wireless communication isprovided that includes a transceiver, a memory configured to storeinstructions, and one or more processors communicatively coupled withthe transceiver and the memory. The one or more processors areconfigured to execute the instructions to determine, by a network node,whether one or more resources correspond to NA resources of the networknode, the NA resources corresponding to a first set of one or moreresources configured at the network node as being unavailable for uplinkand downlink communications between the network node and the wirelessnode, wherein the indication of NA resources of the network nodecomprises an invalid TDD-uplink-downlink configuration; and transmit, bythe network node to the wireless node, an indication of NA resources ofthe network node, wherein the indication is configured to trigger thewireless node to refrain from communication with the network node withinthe NA resources of the network node.

In another aspect, an apparatus for wireless communication is providedthat includes means for determining, by a network node, whether one ormore resources correspond to NA resources of the network node, the NAresources corresponding to a first set of one or more resourcesconfigured at the network node as being unavailable for uplink anddownlink communications between the network node and the wireless node,wherein the indication of NA resources of the network node comprises aninvalid TDD-uplink-downlink configuration; and means for transmitting,by the network node to the wireless node, an indication of NA resourcesof the network node, wherein the indication is configured to trigger thewireless node to refrain from communication with the network node withinthe NA resources of the network node.

In yet another aspect, a non-transitory computer-readable medium isprovided including code executable by one or more processors todetermine, by a network node, whether one or more resources correspondto NA resources of the network node, the NA resources corresponding to afirst set of one or more resources configured at the network node asbeing unavailable for uplink and downlink communications between thenetwork node and the wireless node, wherein the indication of NAresources of the network node comprises an invalid TDD-uplink-downlinkconfiguration; and transmit, by the network node to the wireless node,an indication of NA resources of the network node, wherein theindication is configured to trigger the wireless node to refrain fromcommunication with the network node within the NA resources of thenetwork node.

According to another example, a method of wireless communicationincludes receiving, by a parent distributed unit (DU) from a centralunit (CU), a child resource configuration including an indication of theNA resources via an invalid TDD-uplink-downlink configuration; anddetermining, by the parent DU, one or more NA resources based on thechild resource configuration, the one or more NA resources correspondingto a set of one or more resources configured at the parent DU as beingunavailable for uplink and downlink communications between the parent DUand a child node of the parent DU.

In a further example, an apparatus for wireless communication isprovided that includes a transceiver, a memory configured to storeinstructions, and one or more processors communicatively coupled withthe transceiver and the memory. The one or more processors areconfigured to execute the instructions to receive, by a parent DU from aCU, a child resource configuration including an indication of the NAresources via an invalid TDD-uplink-downlink configuration; anddetermine, by the parent DU, one or more NA resources based on the childresource configuration, the one or more NA resources corresponding to aset of one or more resources configured at the parent DU as beingunavailable for uplink and downlink communications between the parent DUand a child node of the parent DU.

In another aspect, an apparatus for wireless communication is providedthat includes means for receiving, by a parent DU from a central unit(CU), a child resource configuration including an indication of the NAresources via an invalid TDD-uplink-downlink configuration; and meansfor determining, by the parent DU, one or more NA resources based on thechild resource configuration, the one or more NA resources correspondingto a set of one or more resources configured at the parent DU as beingunavailable for uplink and downlink communications between the parent DUand a child node of the parent DU.

In yet another aspect, a non-transitory computer-readable medium isprovided including code executable by one or more processors to receive,by a parent DU from a central unit (CU), a child resource configurationincluding an indication of the NA resources via an invalidTDD-uplink-downlink configuration; and determine, by the parent DU, oneor more NA resources based on the child resource configuration, the oneor more NA resources corresponding to a set of one or more resourcesconfigured at the parent DU as being unavailable for uplink and downlinkcommunications between the parent DU and a child node of the parent DU.

According to another example, a method of wireless communicationincludes determining, by a CU, a child resource configuration for achild node including an indication of NA resources, wherein the NAresources correspond to a set of one or more resources configured at aparent DU as being unavailable for uplink and downlink communicationsbetween the parent DU and the child node of the parent DU; and sending,by the CU to the parent DU, the child resource configuration includingthe indication of the NA resources via an invalid TDD-uplink-downlinkconfiguration.

In a further example, an apparatus for wireless communication isprovided that includes a transceiver, a memory configured to storeinstructions, and one or more processors communicatively coupled withthe transceiver and the memory. The one or more processors areconfigured to execute the instructions to determine, by a CU, a childresource configuration for a child node including an indication of NAresources, wherein the NA resources correspond to a set of one or moreresources configured at a parent DU as being unavailable for uplink anddownlink communications between the parent DU and the child node of theparent DU; and send, by the CU to the parent DU, the child resourceconfiguration including the indication of the NA resources via aninvalid TDD-uplink-downlink configuration.

In another aspect, an apparatus for wireless communication is providedthat includes means for determining, by a CU, a child resourceconfiguration for a child node including an indication of NA resources,wherein the NA resources correspond to a set of one or more resourcesconfigured at a parent DU as being unavailable for uplink and downlinkcommunications between the parent DU and the child node of the parentDU; and means for sending, by the CU to the parent DU, the childresource configuration including the indication of the NA resources viaan invalid TDD-uplink-downlink configuration.

In yet another aspect, a non-transitory computer-readable medium isprovided including code executable by one or more processors todetermine, by a CU, a child resource configuration for a child nodeincluding an indication of NA resources, wherein the NA resourcescorrespond to a set of one or more resources configured at a parent DUas being unavailable for uplink and downlink communications between theparent DU and the child node of the parent DU; and send, by the CU tothe parent DU, the child resource configuration including the indicationof the NA resources via an invalid TDD-uplink-downlink configuration.

To the accomplishment of the foregoing and related ends, the one or moreaspects comprise the features hereinafter fully described andparticularly pointed out in the claims. The following description andthe annexed drawings set forth in detail certain illustrative featuresof the one or more aspects. These features are indicative, however, ofbut a few of the various ways in which the principles of various aspectsmay be employed, and this description is intended to include all suchaspects and their equivalents.

BRIEF DESCRIPTION OF THE DRAWINGS

The disclosed aspects will hereinafter be described in conjunction withthe appended drawings, provided to illustrate and not to limit thedisclosed aspects, wherein like designations denote like elements, andin which:

FIG. 1 illustrates an example of a wireless communication system, inaccordance with various aspects of the present disclosure;

FIG. 2 is a block diagram illustrating an example of a network entity(also referred to as a base station), in accordance with various aspectsof the present disclosure;

FIG. 3 is a block diagram illustrating an example of a user equipment(UE), in accordance with various aspects of the present disclosure;

FIG. 4 is a diagram of an example integrated access and backhaul (IAB)system, in accordance with various aspects of the present disclosure;

FIG. 5 is a diagram of an example IAB system for allocating resources inaccordance with various aspects of the present disclosure;

FIG. 6 is a flow chart illustrating an example of a method for wirelesscommunications at a node such as an IAB node in accordance with variousaspects of the present disclosure;

FIG. 7 is a flow chart illustrating an example of a method for wirelesscommunications at a node such as an IAB node in accordance with variousaspects of the present disclosure;

FIG. 8 is a flow chart illustrating an example of a method for wirelesscommunications at a node such as an IAB node in accordance with variousaspects of the present disclosure;

FIG. 9 is a flow chart illustrating an example of a method for wirelesscommunications at a node such as an IAB node in accordance with variousaspects of the present disclosure; and

FIG. 10 is a block diagram illustrating an example of a MIMOcommunication system including a base station and a UE, in accordancewith various aspects of the present disclosure.

DETAILED DESCRIPTION

Various aspects are now described with reference to the drawings. In thefollowing description, for purposes of explanation, numerous specificdetails are set forth in order to provide a thorough understanding ofone or more aspects. It may be evident, however, that such aspect(s) maybe practiced without these specific details.

The described features generally relate to resource allocation in anintegrated access and backhaul (IAB) system. Specifically, base stationsmay include a backhaul interface for communication with a backhaulportion of the network. The backhaul may provide a link between a basestation and a core network, and in some examples, the backhaul mayprovide interconnection between the respective base stations. The corenetwork is a part of a wireless communication system that is generallyindependent of the radio access technology used in the radio accessnetwork. Various types of backhaul interfaces may be employed, such as adirect physical connection, a virtual network, or the like using anysuitable transport network. Some base stations may be configured as IABnodes, where the wireless spectrum may be used both for access links(i.e., wireless links with user equipments (UEs)), and for backhaullinks, which may be referred to as wireless self-backhauling. By usingwireless self-backhauling, rather than requiring each new base stationdeployment to be outfitted with its own hard-wired backhaul connection,the wireless spectrum utilized for communication between the basestation and UE may be leveraged for backhaul communication, enablingfast and easy deployment of highly dense small cell networks.

With respect to resource allocation, current framework supports onlyper-cell resource configuration and a child-node may not be aware abouta not-available (NA) resource configuration of a parent-node. In someimplementations, according to the present aspects, a CU central unit(CU) may provide a per child link resource configuration to eachparent-node distributed unit (parent DU), such as a parent DU havingmultiple cells or two or more parent DUs serving a same child-node. Bybeing aware of the per child link resource configuration, as opposed toa per cell resource configuration, each parent DU may have moreflexibility in scheduling, which may improve efficiency in the use ofnetwork resources. Further, in some implementations, according to thepresent aspects, the child-node may be made aware of the resourceconfigurations associated with the parent-node, which enables thechild-node to avoid attempting to transmit or receive communicationswith the parent-node during such NA resources, thereby saving power,avoiding interference, and/or avoiding incorrectly inferring channelquality and allowing the child-node to instead communicate with itschildren.

As such, it would be desirable to implement such techniques to an IABsystem. Specifically, an IAB-node may have one or more mobileterminations (MTs), and one or more DUs (e.g., and each DU has one ormore cells/sectors). Each entity (MT and/or cell) may also have one ormore transmission/reception points (TRPs).

In one implementation, the present disclosure includes receiving, by aMT entity from a parent DU, an indication of NA resources of the parentDU, wherein the NA resources correspond to a first set of one or moreresources configured at the parent node as being unavailable for uplinkand downlink communications between the parent DU and the MT entity,determining, by the MT entity, a second set of one or more resourcesdifferent from the first set, based on the indication of the NAresources of the parent DU, and communicating, between the MT entity andthe parent DU, using the second set of one or more resources.

In another implementation, the present disclosure includes determining,by a CU, a child resource configuration for a MT entity including anindication of NA DU-child resources, wherein the NA DU-child resourcescorrespond to a set of one or more resources configured at a parent DUas being unavailable for uplink and downlink communications between theparent DU and an MT entity that is a child node of the parent DU; andsending, by the CU to the parent DU, the child resource configurationincluding the indication of the NA DU-child resources.

The described features will be presented in more detail below withreference to FIGS. 1-10 .

As used in this application, the terms “component,” “module,” “system”and the like are intended to include a computer-related entity, such asbut not limited to hardware, software, a combination of hardware andsoftware, or software in execution. For example, a component may be, butis not limited to being, a process running on a processor, a processor,an object, an executable, a thread of execution, a program, and/or acomputer. By way of illustration, both an application running on acomputing device and the computing device can be a component. One ormore components can reside within a process and/or thread of executionand a component can be localized on one computer and/or distributedbetween two or more computers. In addition, these components can executefrom various computer readable media having various data structuresstored thereon. The components can communicate by way of local and/orremote processes such as in accordance with a signal having one or moredata packets, such as data from one component interacting with anothercomponent in a local system, distributed system, and/or across a networksuch as the Internet with other systems by way of the signal. Softwareshall be construed broadly to mean instructions, instruction sets, code,code segments, program code, programs, subprograms, software modules,applications, software applications, software packages, routines,subroutines, objects, executables, threads of execution, procedures,functions, etc., whether referred to as software, firmware, middleware,microcode, hardware description language, or otherwise.

Techniques described herein may be used for various wirelesscommunication systems such as CDMA, TDMA, FDMA, OFDMA, SC-FDMA, andother systems. The terms “system” and “network” may often be usedinterchangeably. A CDMA system may implement a radio technology such asCDMA2000, Universal Terrestrial Radio Access (UTRA), etc. CDMA2000covers IS-2000, IS-95, and IS-856 standards. IS-2000 Releases 0 and Aare commonly referred to as CDMA2000 1×, 1×, etc. IS-856 (TIA-856) iscommonly referred to as CDMA2000 1×EV-DO, High Rate Packet Data (HRPD),etc. UTRA includes Wideband CDMA (WCDMA) and other variants of CDMA. ATDMA system may implement a radio technology such as Global System forMobile Communications (GSM). An OFDMA system may implement a radiotechnology such as Ultra Mobile Broadband (UMB), Evolved UTRA (E-UTRA),Institute of Electrical and Electronics Engineers (IEEE) 802.11 (Wi-Fi),IEEE 802.16 (WiMAX), IEEE 802.20, Flash-OFDM™, etc. UTRA and E-UTRA arepart of Universal Mobile Telecommunication System (UMTS). 3GPP Long TermEvolution (LTE) and LTE-Advanced (LTE-A) are new releases of UMTS thatuse E-UTRA. UTRA, E-UTRA, UMTS, LTE, LTE-A, and GSM are described indocuments from an organization named “3rd Generation PartnershipProject” (3GPP). CDMA2000 and UMB are described in documents from anorganization named “3rd Generation Partnership Project 2” (3GPP2). Thetechniques described herein may be used for the systems and radiotechnologies mentioned above as well as other systems and radiotechnologies, including cellular (e.g., LTE) communications over ashared radio frequency spectrum band. The description below, however,describes an LTE/LTE-A system for purposes of example, and LTEterminology is used in much of the description below, although thetechniques are applicable beyond LTE/LTE-A applications (e.g., to fifthgeneration (5G) NR networks or other next generation communicationsystems).

The following description provides examples, and is not limiting of thescope, applicability, or examples set forth in the claims. Changes maybe made in the function and arrangement of elements discussed withoutdeparting from the scope of the disclosure. Various examples may omit,substitute, or add various procedures or components as appropriate. Forinstance, the methods described may be performed in an order differentfrom that described, and various steps may be added, omitted, orcombined. Also, features described with respect to some examples may becombined in other examples.

Various aspects or features will be presented in terms of systems thatcan include a number of devices, components, modules, and the like. Itis to be understood and appreciated that the various systems can includeadditional devices, components, modules, etc. and/or may not include allof the devices, components, modules etc. discussed in connection withthe figures. A combination of these approaches can also be used.

FIG. 1 is a diagram illustrating an example of a wireless communicationssystem and an access network 100. The wireless communications system(also referred to as a wireless wide area network (WWAN)) can includebase stations 102, UEs 104, an Evolved Packet Core (EPC) 160, and/or a5G Core (5GC) 190. The base stations 102, which may also be referred toas network entities, may include macro cells (high power cellular basestation) and/or small cells (low power cellular base station). The macrocells can include base stations. The small cells can include femtocells,picocells, and microcells. In an example, the base stations 102 may alsoinclude gNBs 180, as described further herein.

In one example, some nodes acting as an IAB node, such as base station102/gNB 180, may have a modem 240 and communicating component 242 forallocating resources, as described herein. Though a base station 102/gNB180 is shown as having the modem 240 and communicating component 242,this is one illustrative example, and substantially any node or type ofnode acting as an IAB node may include a modem 240 and communicatingcomponent 242 for providing corresponding functionalities describedherein. In an example, communicating component 242 may include NAresources of parent 252 and NA DU-child resources 254. For example,modem 240 and/or communicating component 242 may receive, from a parentDU, an indication of NA resources of the parent DU, the NA resourcescorresponding to a first set of one or more resources configured at theparent DU as being unavailable for uplink and downlink communicationsbetween the parent DU and the wireless node, wherein the indication ofNA resources of the parent DU comprises an invalid TDD-uplink-downlinkconfiguration; and refrain from communicating with the parent DU withinthe NA resources based on the indication of NA resources of the parentDU.

The base stations 102 configured for 4G LTE (which can collectively bereferred to as Evolved Universal Mobile Telecommunications System (UMTS)Terrestrial Radio Access Network (E-UTRAN)) may interface with the EPC160 through backhaul links 132 (e.g., using an S1 interface). The basestations 102 configured for 5G NR (which can collectively be referred toas Next Generation RAN (NG-RAN)) may interface with 5GC 190 throughbackhaul links 184. In addition to other functions, the base stations102 may perform one or more of the following functions: transfer of userdata, radio channel ciphering and deciphering, integrity protection,header compression, mobility control functions (e.g., handover, dualconnectivity), inter-cell interference coordination, connection setupand release, load balancing, distribution for non-access stratum (NAS)messages, NAS node selection, synchronization, radio access network(RAN) sharing, multimedia broadcast multicast service (MBMS), subscriberand equipment trace, RAN information management (RIM), paging,positioning, and delivery of warning messages. The base stations 102 maycommunicate directly or indirectly (e.g., through the EPC 160 or 5GC190) with each other over backhaul links 134 (e.g., using an X2interface). The backhaul links 132, 134 and/or 184 may be wired orwireless.

The base stations 102 may wirelessly communicate with one or more UEs104. Each of the base stations 102 may provide communication coveragefor a respective geographic coverage area 110. There may be overlappinggeographic coverage areas 110. For example, the small cell 102′ may havea coverage area 110′ that overlaps the coverage area 110 of one or moremacro base stations 102. A network that includes both small cell andmacro cells may be referred to as a heterogeneous network. Aheterogeneous network may also include Home Evolved Node Bs (eNBs)(HeNBs), which may provide service to a restricted group, which can bereferred to as a closed subscriber group (CSG). The communication links120 between the base stations 102 and the UEs 104 may include uplink(UL) (also referred to as reverse link) transmissions from a UE 104 to abase station 102 and/or downlink (DL) (also referred to as forward link)transmissions from a base station 102 to a UE 104. The communicationlinks 120 may use multiple-input and multiple-output (MIMO) antennatechnology, including spatial multiplexing, beamforming, and/or transmitdiversity. The communication links may be through one or more carriers.The base stations 102/UEs 104 may use spectrum up to Y MHz (e.g., 5, 10,15, 20, 100, 400, etc. MHz) bandwidth per carrier allocated in a carrieraggregation of up to a total of Yx MHz (e.g., for x component carriers)used for transmission in the DL and/or the UL direction. The carriersmay or may not be adjacent to each other. Allocation of carriers may beasymmetric with respect to DL and UL (e.g., more or less carriers may beallocated for DL than for UL). The component carriers may include aprimary component carrier and one or more secondary component carriers.A primary component carrier may be referred to as a primary cell (PCell)and a secondary component carrier may be referred to as a secondary cell(SCell).

In another example, certain UEs 104 may communicate with each otherusing device-to-device (D2D) communication link 158. The D2Dcommunication link 158 may use the DL/UL WWAN spectrum. The D2Dcommunication link 158 may use one or more sidelink channels, such as aphysical sidelink broadcast channel (PSBCH), a physical sidelinkdiscovery channel (PSDCH), a physical sidelink shared channel (PSSCH),and a physical sidelink control channel (PSCCH). D2D communication maybe through a variety of wireless D2D communications systems, such as forexample, FlashLinQ, WiMedia, Bluetooth, ZigBee, Wi-Fi based on the IEEE802.11 standard, LTE, or NR.

The wireless communications system may further include a Wi-Fi accesspoint (AP) 150 in communication with Wi-Fi stations (STAs) 152 viacommunication links 154 in a 5 GHz unlicensed frequency spectrum. Whencommunicating in an unlicensed frequency spectrum, the STAs 152/AP 150may perform a clear channel assessment (CCA) prior to communicating inorder to determine whether the channel is available.

The small cell 102′ may operate in a licensed and/or an unlicensedfrequency spectrum. When operating in an unlicensed frequency spectrum,the small cell 102′ may employ NR and use the same 5 GHz unlicensedfrequency spectrum as used by the Wi-Fi AP 150. The small cell 102′,employing NR in an unlicensed frequency spectrum, may boost coverage toand/or increase capacity of the access network.

A base station 102, whether a small cell 102′ or a large cell (e.g.,macro base station), may include an eNB, gNodeB (gNB), or other type ofbase station. Some base stations, such as gNB 180 may operate in atraditional sub 6 GHz spectrum, in millimeter wave (mmW) frequencies,and/or near mmW frequencies in communication with the UE 104. When thegNB 180 operates in mmW or near mmW frequencies, the gNB 180 may bereferred to as an mmW base station. Extremely high frequency (EHF) ispart of the RF in the electromagnetic spectrum. EHF has a range of 30GHz to 300 GHz and a wavelength between 1 millimeter and 10 millimeters.Radio waves in the band may be referred to as a millimeter wave. NearmmW may extend down to a frequency of 3 GHz with a wavelength of 100millimeters. The super high frequency (SHF) band extends between 3 GHzand 30 GHz, also referred to as centimeter wave. Communications usingthe mmW/near mmW radio frequency band has extremely high path loss and ashort range. The mmW base station 180 may utilize beamforming 182 withthe UE 104 to compensate for the extremely high path loss and shortrange. A base station 102 referred to herein can include a gNB 180.

The EPC 160 may include a Mobility Management Entity (MME) 162, otherMMEs 164, a Serving Gateway 166, a Multimedia Broadcast MulticastService (MBMS) Gateway 168, a Broadcast Multicast Service Center (BM-SC)170, and a Packet Data Network (PDN) Gateway 172. The MME 162 may be incommunication with a Home Subscriber Server (HSS) 174. The MME 162 isthe control node that processes the signaling between the UEs 104 andthe EPC 160. Generally, the MME 162 provides bearer and connectionmanagement. All user Internet protocol (IP) packets are transferredthrough the Serving Gateway 166, which itself is connected to the PDNGateway 172. The PDN Gateway 172 provides UE IP address allocation aswell as other functions. The PDN Gateway 172 and the BM-SC 170 areconnected to the IP Services 176. The IP Services 176 may include theInternet, an intranet, an IP Multimedia Subsystem (IMS), a packetswitched (PS) Streaming Service, and/or other IP services. The BM-SC 170may provide functions for MBMS user service provisioning and delivery.The BM-SC 170 may serve as an entry point for content provider MBMStransmission, may be used to authorize and initiate MBMS Bearer Serviceswithin a public land mobile network (PLMN), and may be used to scheduleMBMS transmissions. The MBMS Gateway 168 may be used to distribute MBMStraffic to the base stations 102 belonging to a Multicast BroadcastSingle Frequency Network (MBSFN) area broadcasting a particular service,and may be responsible for session management (start/stop) and forcollecting eMBMS related charging information.

The 5GC 190 may include a Access and Mobility Management Function (AMF)192, other AMFs 193, a Session Management Function (SMF) 194, and a UserPlane Function (UPF) 195. The AMF 192 may be in communication with aUnified Data Management (UDM) 196. The AMF 192 can be a control nodethat processes the signaling between the UEs 104 and the 5GC 190.Generally, the AMF 192 can provide QoS flow and session management. UserInternet protocol (IP) packets (e.g., from one or more UEs 104) can betransferred through the UPF 195. The UPF 195 can provide UE IP addressallocation for one or more UEs, as well as other functions. The UPF 195is connected to the IP Services 197. The IP Services 197 may include theInternet, an intranet, an IP Multimedia Subsystem (IMS), a PS StreamingService, and/or other IP services.

The base station may also be referred to as a gNB, Node B, evolved NodeB (eNB), an access point, a base transceiver station, a radio basestation, a radio transceiver, a transceiver function, a basic serviceset (BSS), an extended service set (ESS), a transmit reception point(TRP), or some other suitable terminology. The base station 102 providesan access point to the EPC 160 or 5GC 190 for a UE 104. Examples of UEs104 include a cellular phone, a smart phone, a session initiationprotocol (SIP) phone, a laptop, a personal digital assistant (PDA), asatellite radio, a positioning system (e.g., satellite, terrestrial), amultimedia device, a video device, a digital audio player (e.g., MP3player), a camera, a game console, a tablet, a smart device, robots,drones, an industrial/manufacturing device, a wearable device (e.g., asmart watch, smart clothing, smart glasses, virtual reality goggles, asmart wristband, smart jewelry (e.g., a smart ring, a smart bracelet)),a vehicle/a vehicular device, a meter (e.g., parking meter, electricmeter, gas meter, water meter, flow meter), a gas pump, a large or smallkitchen appliance, a medical/healthcare device, an implant, asensor/actuator, a display, or any other similar functioning device.Some of the UEs 104 may be referred to as IoT devices (e.g., meters,pumps, monitors, cameras, industrial/manufacturing devices, appliances,vehicles, robots, drones, etc.). IoT UEs may include Machine-TypeCommunication (MTC)/enhanced MTC (eMTC, also referred to as category(Cat)-M, Cat M1) UEs, NB-IoT (also referred to as Cat-NB1) UEs, as wellas other types of UEs. In the present disclosure, eMTC and NB-IoT mayrefer to future technologies that may evolve from or may be based onthese technologies. For example, eMTC may include FeMTC (further eMTC),eFeMTC (enhanced further eMTC), mMTC (massive MTC), etc., and NB-IoT mayinclude eNB-IoT (enhanced NB-IoT), FeNB-IoT (further enhanced NB-IoT),etc. The UE 104 may also be referred to as a station, a mobile station,a subscriber station, a mobile unit, a subscriber unit, a wireless unit,a remote unit, a mobile device, a wireless device, a wirelesscommunications device, a remote device, a mobile subscriber station, anaccess terminal, a mobile terminal, a wireless terminal, a remoteterminal, a handset, a user agent, a mobile client, a client, or someother suitable terminology.

Turning now to FIGS. 2-10 , aspects are depicted with reference to oneor more components and one or more methods that may perform the actionsor operations described herein, where aspects in dashed line may beoptional. Although the operations described below in FIGS. 6-9 arepresented in a particular order and/or as being performed by an examplecomponent, it should be understood that the ordering of the actions andthe components performing the actions may be varied, depending on theimplementation. Moreover, it should be understood that the followingactions, functions, and/or described components may be performed by aspecially-programmed processor, a processor executingspecially-programmed software or computer-readable media, or by anyother combination of a hardware component and/or a software componentcapable of performing the described actions or functions.

Referring to FIG. 2 , one example of an implementation of a node actingas an IAB node, such as base station 102 (e.g., a base station 102and/or gNB 180, as described above) may include a variety of components,some of which have already been described above and are describedfurther herein, including components such as one or more processors 212and memory 216 and transceiver 202 in communication via one or morebuses 244, which may operate in conjunction with modem 240 and/orcommunicating component 242 for resource allocation.

In an aspect, the one or more processors 212 can include a modem 240and/or can be part of the modem 240 that uses one or more modemprocessors. Thus, the various functions related to communicatingcomponent 242 may be included in modem 240 and/or processors 212 and, inan aspect, can be executed by a single processor, while in otheraspects, different ones of the functions may be executed by acombination of two or more different processors. For example, in anaspect, the one or more processors 212 may include any one or anycombination of a modem processor, or a baseband processor, or a digitalsignal processor, or a transmit processor, or a receiver processor, or atransceiver processor associated with transceiver 202. In other aspects,some of the features of the one or more processors 212 and/or modem 240associated with communicating component 242 may be performed bytransceiver 202.

Also, memory 216 may be configured to store data used herein and/orlocal versions of applications 275 or communicating component 242 and/orone or more of its subcomponents being executed by at least oneprocessor 212. Memory 216 can include any type of computer-readablemedium usable by a computer or at least one processor 212, such asrandom access memory (RAM), read only memory (ROM), tapes, magneticdiscs, optical discs, volatile memory, non-volatile memory, and anycombination thereof. In an aspect, for example, memory 216 may be anon-transitory computer-readable storage medium that stores one or morecomputer-executable codes defining communicating component 242 and/orone or more of its subcomponents, and/or data associated therewith, whenbase station 102 is operating at least one processor 212 to executecommunicating component 242 and/or one or more of its subcomponents.

Transceiver 202 may include at least one receiver 206 and at least onetransmitter 208. Receiver 206 may include hardware and/or softwareexecutable by a processor for receiving data, the code comprisinginstructions and being stored in a memory (e.g., computer-readablemedium). Receiver 206 may be, for example, a radio frequency (RF)receiver. In an aspect, receiver 206 may receive signals transmitted byat least one base station 102. Additionally, receiver 206 may processsuch received signals, and also may obtain measurements of the signals,such as, but not limited to, Ec/Io, signal-to-noise ratio (SNR),reference signal received power (RSRP), received signal strengthindicator (RSSI), etc. Transmitter 208 may include hardware and/orsoftware executable by a processor for transmitting data, the codecomprising instructions and being stored in a memory (e.g.,computer-readable medium). A suitable example of transmitter 208 mayincluding, but is not limited to, an RF transmitter.

Moreover, in an aspect, base station 102 may include RF front end 288,which may operate in communication with one or more antennas 265 andtransceiver 202 for receiving and transmitting radio transmissions, forexample, wireless communications transmitted by at least one basestation 102 or wireless transmissions transmitted by UE 104. RF frontend 288 may be connected to one or more antennas 265 and can include oneor more low-noise amplifiers (LNAs) 290, one or more switches 292, oneor more power amplifiers (PAs) 298, and one or more filters 296 fortransmitting and receiving RF signals. The antennas 265 may include oneor more antennas, antenna elements, and/or antenna arrays.

In an aspect, LNA 290 can amplify a received signal at a desired outputlevel. In an aspect, each LNA 290 may have a specified minimum andmaximum gain values. In an aspect, RF front end 288 may use one or moreswitches 292 to select a particular LNA 290 and its specified gain valuebased on a desired gain value for a particular application.

Further, for example, one or more PA(s) 298 may be used by RF front end288 to amplify a signal for an RF output at a desired output powerlevel. In an aspect, each PA 298 may have specified minimum and maximumgain values. In an aspect, RF front end 288 may use one or more switches292 to select a particular PA 298 and its specified gain value based ona desired gain value for a particular application.

Also, for example, one or more filters 296 can be used by RF front end288 to filter a received signal to obtain an input RF signal. Similarly,in an aspect, for example, a respective filter 296 can be used to filteran output from a respective PA 298 to produce an output signal fortransmission. In an aspect, each filter 296 can be connected to aspecific LNA 290 and/or PA 298. In an aspect, RF front end 288 can useone or more switches 292 to select a transmit or receive path using aspecified filter 296, LNA 290, and/or PA 298, based on a configurationas specified by transceiver 202 and/or processor 212.

As such, transceiver 202 may be configured to transmit and receivewireless signals through one or more antennas 265 via RF front end 288.In an aspect, transceiver may be tuned to operate at specifiedfrequencies such that UE 104 can communicate with, for example, one ormore base stations 102 or one or more cells associated with one or morebase stations 102. In an aspect, for example, modem 240 can configuretransceiver 202 to operate at a specified frequency and power levelbased on the UE configuration of the UE 104 and the communicationprotocol used by modem 240.

In an aspect, modem 240 can be a multiband-multimode modem, which canprocess digital data and communicate with transceiver 202 such that thedigital data is sent and received using transceiver 202. In an aspect,modem 240 can be multiband and be configured to support multiplefrequency bands for a specific communications protocol. In an aspect,modem 240 can be multimode and be configured to support multipleoperating networks and communications protocols. In an aspect, modem 240can control one or more components of UE 104 (e.g., RF front end 288,transceiver 202) to enable transmission and/or reception of signals fromthe network based on a specified modem configuration. In an aspect, themodem configuration can be based on the mode of the modem and thefrequency band in use. In another aspect, the modem configuration can bebased on UE configuration information associated with UE 104 as providedby the network during cell selection and/or cell reselection.

In an aspect, the processor(s) 212 may correspond to one or more of theprocessors described in connection with the UE in FIG. 10 . Similarly,the memory 216 may correspond to the memory described in connection withthe UE in FIG. 10 .

Referring to FIG. 3 , one example of an implementation of UE 104 mayinclude a variety of components, some of which have already beendescribed above and are described further herein, including componentssuch as one or more processors 312 and memory 316 and transceiver 302 incommunication via one or more buses 344, which may operate inconjunction with modem 340.

The transceiver 302, receiver 306, transmitter 308, one or moreprocessors 312, memory 316, applications 375, buses 344, RF front end388, LNAs 390, switches 392, filters 396, PAs 398, and one or moreantennas 365 may be the same as or similar to the correspondingcomponents of base station 102, as described above, but configured orotherwise programmed for base station operations as opposed to basestation operations.

In an aspect, the processor(s) 312 may correspond to one or more of theprocessors described in connection with the base station in FIG. 10 .Similarly, the memory 316 may correspond to the memory described inconnection with the base station in FIG. 10 .

Further, FIG. 4 is a diagram of an uplink and downlink communicationscheme in an JAB system 400, as described herein. In one example, theIAB system 400 may include an IAB node 404, which may be similar to orthe same as the base station 102. The IAB system 400 may further includea parent node 402, a child node 406, and a UE 104. For example, in anIAB system, an IAB node 404 can transmit uplink data towards theparent-node 402, and receive the uplink data from the UE 104 and/orchild node 406. The IAB node 404 may also transmit downlink data towardsthe child node 406, and receive the downlink data from the parent node402.

In some aspects, the IAB node 404 may host two NR functions: (i) a MT408, used to maintain the wireless backhaul connection towards anupstream IAB-node or IAB-donor, and (ii) a DU 410 to provide accessconnection to the UEs or the downstream MTs of other IAB-nodes. The DU410 may connect to a CU hosted by the IAB-donor by means of the NR F1interface running over the wireless backhaul link. Therefore, in theaccess of IAB nodes and donors there may be a coexistence of twointerfaces, i.e., the Uu interface (e.g., between the UEs and the DU ofthe gNBs) and the aforementioned F1 interface.

The IAB node 404 may include the communicating component 242, which maybe configured to determine a spatial relation between a firstcommunication of a DU 410 entity and a second communication of one ofthe DU entity or a co-located MT 408 entity. The IAB node 404 mayfurther configure a beam of at least one of the MT 408 or the DU 410based on the determined spatial relation, and communicate using the beamwith at least one entity.

In an aspect, an IAB-node MT, e.g., a UE, may be provided TDDconfigurations and slot format indications (SFI). Specifically, theIAB-node MT is provided the same TDD configurations (e.g.,TDD_UL_DL_ConfigurationCommon broadcasted in SIB1) as UEs, and mayadditionally be provided dedicated TDD configurations (e.g.,TDD_UL_DL_ConfigDedicated_IAB_MT, similar to Rel-15TDD_UL_DL_ConfigDedicated, but also supports new slot configurationsthat begin with uplink symbols). The IAB-MT may also be provided SFI(via DCI). However, the SFI table has been extended for IAB to includenew slot formats.

In an aspect, an IAB-node DU may be provided, by the CU, an indicationfor a slot format over a number of slots byIAB-DU-Resource-Configuration. The DU-Resource-Configuration indicatesboth the downlink/uplink/flexible (D/U/F) type of resources, as well ashard/soft/not-available (H/S/NA). The indication of D/U/F resources inthe semi-static DU resource configuration includes the following: theflexibility to configure all of the slot patterns and formats supportedby the existing Rel-15 TDD-UL-DL-Config radio resource control (RRC)configurations and slot format table; and new slot formats defined onlyfor IAB nodes (DU and MTs) which begin with uplink slots, uplinksymbols, or flexible symbols. Additionally, H/S/NA attributes for theper-cell DU resource configuration are explicitly indicated per-resourcetype (D/U/F) in each slot.

Further, in an example, a parent IAB node/donor may be provided with thefull D/U/F and H/S/NA resource configuration of each child IAB-DU. Thisextra information has three main uses. First, a parent-node with theknowledge of a child DU resource configuration (and the multiplexingcapabilities of the child) may avoid potential conflicts. For example,if the same set of resources are allocated as hard to both parent-nodeand the child-node then the parent-node may avoid communicating with thechild over those resources. Second, a parent-node will know theconfiguration of soft resources of the child for sending theavailability indication. Third, a child-node may need a guard periodwhen switching between communicating over parent-backhaul (BH) link (MTTX or MT RX), and communicating over the child-links (DU TX or DU RX).Rel-16 IAB introduced new signaling where a child-node may request forguard symbols (per switch type), and parent-node may indicate the amountof guard symbols (per switch type) it is willing to provide. Todetermine the location and amount of such guard symbols, the childresource configuration should be known by the parent-node.

FIG. 5 is a diagram of resource allocation in an IAB system 500, asdescribed herein. In one example, the IAB system 500 may include an IABnode, which may be similar to or the same as the base station 102. IABsystem 500 may include a CU 502, DU 504, one or more child DUs 506, 508,510 and child nodes 1, 2, and 3.

In an aspect, one drawback of the current framework is that the currentframework supports only per-cell resource configuration. That is, a DU504 may comprise multiple cells, and for each cell the DU is provided aD/U/F and H/S/NA resource configuration. Accordingly, being able toconfigure resources per child-link provides a flexibility to the networkto better utilize the resources. As such, with the knowledge of thechild resource allocation, various per-child resource configurationscould be effectively created at the parent-node. For example,

-   -   Parent-node DU resource configuration: [slot n, slot n+1]=[H, H]    -   Child 1 DU 506: [slot n, slot n+1]=[H, NA]    -   Child 2 DU 508: [slot n, slot n+1]=[NA, H]

The parent-node DU 504, with the knowledge of child 1 506 and 2 508allocated resource, may infer that:

-   -   For communicating with child 1 506: [slot n, slot n+1]=[NA, H]    -   For communicating with child 2 508: [slot n, slot n+1]=[H, NA]

In an aspect, for a multi-parent configuration, child C is connected totwo parent nodes P1 and P2, and due to half-duplex constraint, C mayneed to time-division multiplex communications with P1, P2, and ownchildren. For example, C may be configured to communicate with P1 and P2during slots n and n+1 respectively, and with own children during slotn+2: C's DU resource configuration: [slot n, slot n+1, slot n+2]=[NA,NA, H].

Further, parent node 1 (P1) and parent node 2 (P2) may have additionalchildren, and may provide resources to these additional resources:

-   -   P1 DU resource configuration: [slot n, slot n+1, slot n+2]=[H,        H, H]    -   P2 DU resource configuration: [slot n, slot n+1, slot n+2]=[H,        H, H]

P1 may be configured for communication with child C: [slot n, slot n+1,slot n+2]=[H, NA, NA], which cannot be inferred from the knowledge ofthe DU resource configuration of CU of [NA, NA, H] (because [H, H,H]−[NA, NA, H]:=[H, H, NA]). Thus, the present disclosure providesapparatus and methods that enable allocating resources per child-linkand not per-cell.

In another aspect, another drawback of the current framework is that thea child-node is not aware of an NA resource configuration of acorresponding parent-node (parent DU). If some resources are NA for theparent-node, then no DL/UL communication may occur between the child andparent-node within those resources. Without the knowledge of allocatedresources of the parent-node, the child may attempt to receive (RX) ortransmit (TX) signals within NA resources. This may result inimplications, such as, but not limited to, power consumption,interference, and incorrect inference of the channel/link quality at thechild-node. Furthermore, such resources may have been used for othercommunications of the child-node (e.g. communication withgrand-children, or with another parent). Accordingly, to the presentdisclosure provides apparatus and methods that enable providing achild-node with (or at least part of) H/S/NA configuration of theparent-node.

Turning now to FIGS. 6-9 , aspects are depicted with reference to one ormore components and one or more methods that may perform the actions oroperations described herein, where aspects in dashed line may beoptional. Although the operations described below in FIGS. 6-9 arepresented in a particular order and/or as being performed by an examplecomponent, it should be understood that the ordering of the actions andthe components performing the actions may be varied, depending on theimplementation. Moreover, it should be understood that the followingactions, functions, and/or described components may be performed byreference to one or more components of FIGS. 1, 2, 4, 5 and/or 10 , asdescribed herein, a specially-programmed processor, a processorexecuting specially-programmed software or computer-readable media, orby any other combination of a hardware component and/or a softwarecomponent capable of performing the described actions or functions.

FIG. 6 illustrates a flow chart of an example of a method 600 forwireless communication at a node, which may be an IAB node, and morespecifically, resource allocation in an IAB system. In an example, abase station 102 can perform the functions described in method 600 usingone or more of the components described in FIGS. 1, 2, 4, 5, and 10 .

At block 602, the method 600 may receive, by a wireless node, anindication of NA resources of a parent node, the NA resourcescorresponding to a first set of one or more resources configured at theparent node as being unavailable for uplink and downlink communicationsbetween the parent node and the wireless node, wherein the indication ofNA resources of the parent node comprises an invalid TDD-uplink-downlinkconfiguration. In an aspect, the communicating component 242, e.g., inconjunction with processor(s) 212, memory 216, and/or transceiver 202,may be configured to receive an indication of NA resources of a parentnode, the NA resources corresponding to a first set of one or moreresources configured at the parent node as being unavailable for uplinkand downlink communications between the parent node and the wirelessnode, wherein the indication of NA resources of the parent nodecomprises an invalid TDD-uplink-downlink configuration. In one example,the data can be associated with a priority level. Thus, the base station102, the processor(s) 212, the communicating component 242 or one of itssubcomponents may define the means for receiving, by a wireless node, anindication of NA resources of a parent node, the NA resourcescorresponding to a first set of one or more resources configured at theparent node as being unavailable for uplink and downlink communicationsbetween the parent node and the wireless node, wherein the indication ofNA resources of the parent node comprises an invalid TDD-uplink-downlinkconfiguration. For example, in an aspect, the base station 102 and/orthe communication component 242 may receive a signal from a wirelessnode, determine that it corresponds to an indication of NA resources ofa parent node, and/or performs other signal processes such as describedabove in FIG. 2 .

At block 604, the method 600 may refrain, by the wireless node, fromcommunicating with the parent node within the NA resources based on theindication of NA resources of the parent node. In an aspect, thecommunicating component 242, e.g., in conjunction with processor(s) 212,memory 216, and/or transceiver 202, may be configured to refrain fromcommunicating with the parent node within the NA resources based on theindication of NA resources of the parent node. Thus, the base station102, the processor(s) 212, the communicating component 242 or one of itssubcomponents may define the means for refraining, by the wireless node,from communicating with the parent node within the NA resources based onthe indication of NA resources of the parent node. For example, in anaspect, the base station 102 and/or the communication component 242 maydetermine based on a signal to refrain from communicating with a parentnode, and/or performs other signal processes such as described above inFIG. 2 .

In some aspects, the communicating component 242, e.g., in conjunctionwith processor(s) 212, memory 216, and/or transceiver 202 configured torefraining from communicating with the parent node within NA resourcesfurther comprises determining, by the wireless node, a second set of oneor more resources different from the first set, based on the indicationof the NA resources of the parent node; and communicating, between thewireless node and the parent node, using the second set of one or moreresources.

In some aspects, the second set of one or more resources is in adifferent slot than the first set of one or more resources.

In some aspects, the communicating component 242, e.g., in conjunctionwith processor(s) 212, memory 216, and/or transceiver 202 may beconfigured to determining the invalid TDD-uplink-downlink configurationby determining that a symbol sum of a first number of indicated downlinksymbols and a second number of indicated uplink symbols of a slotconfiguration is greater than a symbol number threshold; and inferringthe invalid TDD-uplink-downlink configuration based on the symbol sum ofthe slot configuration being greater than the symbol number threshold.

In some aspects, the communicating component 242, e.g., in conjunctionwith processor(s) 212, memory 216, and/or transceiver 202 may beconfigured to determining the invalid uplink-downlink TDD configurationby identifying an invalid downlink/uplink/flexible (D/U/F) slotconfiguration.

For example, in some aspects, the indication of NA resources of theparent node corresponds to a second TDD-uplink-downlink configuration,and further comprising determining the invalid TDD-uplink-downlinkconfiguration by determining whether the second TDD-uplink-downlinkconfiguration complies with a first TDD-uplink-downlink configurationreceived prior to the second TDD-uplink-downlink configuration; andidentifying the invalid TDD-uplink-downlink configuration based on adetermination that the second TDD-uplink-downlink configuration does notcomply with the first TDD-uplink-downlink configuration.

In some aspects, the first TDD-uplink-downlink configuration comprises aTDD common configuration for a slot, and wherein the secondTDD-uplink-downlink configuration comprises a TDD-uplink-downlinkdedicated configuration for the slot.

In some aspects, the wireless node corresponds to at least one of a MTentity of an IAB node or a UE.

In some aspects, the communicating component 242, e.g., in conjunctionwith processor(s) 212, memory 216, and/or transceiver 202 configured toreceiving the indication of the NA resources of the parent node includereceiving, by the wireless node from at least one of a parent DU or aCU, the indication of the NA resources of the parent node.

FIG. 7 illustrates a flow chart of an example of a method 700 forwireless communication at a node, which may be an IAB node, and morespecifically, resource allocation in an IAB system. In an example, abase station 102 can perform the functions described in method 700 usingone or more of the components described in FIGS. 1, 2, 4, 5, and 10 .

At block 702, the method 700 may determine, by a network node, whetherone or more resources correspond to NA resources of the network node,the NA resources corresponding to a first set of one or more resourcesconfigured at the network node as being unavailable for uplink anddownlink communications between the network node and the wireless node,wherein the indication of NA resources of the network node comprises aninvalid TDD-uplink-downlink configuration. In an aspect, thecommunicating component 242, e.g., in conjunction with processor(s) 212,memory 216, and/or transceiver 202, may be configured to determine, by anetwork node, whether one or more resources correspond to NA resourcesof the network node, the NA resources corresponding to a first set ofone or more resources configured at the network node as beingunavailable for uplink and downlink communications between the networknode and the wireless node, wherein the indication of NA resources ofthe network node comprises an invalid TDD-uplink-downlink configuration.Thus, the base station 102, the processor(s) 212, the communicatingcomponent 242 or one of its subcomponents may define the means fordetermining, by a network node, whether one or more resources correspondto NA resources of the network node, the NA resources corresponding to afirst set of one or more resources configured at the network node asbeing unavailable for uplink and downlink communications between thenetwork node and the wireless node, wherein the indication of NAresources of the network node comprises an invalid TDD-uplink-downlinkconfiguration. For example, in an aspect, the base station 102 and/orthe communication component 242 may receive a signal, determine whetherone or more resources correspond to NA resources of the network node,and/or performs other signal processes such as described above in FIG. 2.

At block 704, the method 700 may transmit, by the network node to thewireless node, an indication of NA resources of the network node,wherein the indication is configured to trigger the wireless node torefrain from communication with the network node within the NA resourcesof the network node. In an aspect, the communicating component 242,e.g., in conjunction with processor(s) 212, memory 216, and/ortransceiver 202, may be configured to transmit, by the network node tothe wireless node, an indication of NA resources of the network node,wherein the indication is configured to trigger the wireless node torefrain from communication with the network node within the NA resourcesof the network node. Thus, the base station 102, the processor(s) 212,the communicating component 242 or one of its subcomponents may definethe means for transmitting, by the network node to the wireless node, anindication of NA resources of the network node, wherein the indicationis configured to trigger the wireless node to refrain from communicationwith the network node within the NA resources of the network node. Forexample, in an aspect, the base station 102 and/or the communicationcomponent 242 may process a signal into an indication, transmit theindication of NA resources of the network node, and/or performs othersignal processes such as described above in FIG. 2 .

In some aspects, the network node corresponds to at least one of CU or aDU.

In some aspects, the wireless node corresponds to at least one of a MTentity or a UE.

In some aspects, the indication of NA resources of the parent DUcorresponds to a second TDD-uplink-downlink configuration received aftera first TDD-uplink-downlink configuration, and wherein the invalidTDD-uplink-downlink configuration corresponds to the secondTDD-uplink-downlink configuration failing to comply with the firstTDD-uplink-downlink configuration.

In some aspects, the first TDD-uplink-downlink configuration comprises aTDD configuration for a slot provided as part of IAB-DU resourceallocation, and wherein the second TDD-uplink-downlink configurationcomprises a TDD-uplink-downlink dedicated configuration for the slot.

In some aspects, the first TDD-uplink-downlink configuration comprises aTDD common configuration for a slot, and wherein the secondTDD-uplink-downlink configuration comprises a TDD-uplink-downlinkdedicated configuration for the slot.

FIG. 8 illustrates a flow chart of an example of a method 800 forwireless communication at a node, which may be an IAB node, and morespecifically, resource allocation in an IAB system. In an example, abase station 102 can perform the functions described in method 800 usingone or more of the components described in FIGS. 1, 2, 4, 5, and 10 .

At block 802, the method 800 may receive, by a parent DU from a CU, achild resource configuration including an indication of the NA resourcesvia an invalid TDD-uplink-downlink configuration. In an aspect, thecommunicating component 242, e.g., in conjunction with processor(s) 212,memory 216, and/or transceiver 202, may be configured to receive, by aparent DU from a CU, a child resource configuration including anindication of the NA resources via an invalid TDD-uplink-downlinkconfiguration. Thus, the base station 102, the processor(s) 212, thecommunicating component 242 or one of its subcomponents may define themeans for receiving, by a parent DU from a CU, a child resourceconfiguration including an indication of the NA resources via an invalidTDD-uplink-downlink configuration. For example, in an aspect, the basestation 102 and/or the communication component 242 may receive a signalfrom a CU, determine that it corresponds to a child resourceconfiguration including an indication of the NA resources, and/orperforms other signal processes such as described above in FIG. 2 .

At block 804, the method 800 may determine, by the parent DU, one ormore NA resources based on the child resource configuration, the one ormore NA resources corresponding to a set of one or more resourcesconfigured at the parent DU as being unavailable for uplink and downlinkcommunications between the parent DU and a child node of the parent DU.In an aspect, the communicating component 242, e.g., in conjunction withprocessor(s) 212, memory 216, and/or transceiver 202, may be configuredto determine, by the parent DU, one or more NA resources based on thechild resource configuration, the one or more NA resources correspondingto a set of one or more resources configured at the parent DU as beingunavailable for uplink and downlink communications between the parent DUand a child node of the parent DU. Thus, the base station 102, theprocessor(s) 212, the communicating component 242 or one of itssubcomponents may define the means for determining, by the parent DU,one or more NA resources based on the child resource configuration, theone or more NA resources corresponding to a set of one or more resourcesconfigured at the parent DU as being unavailable for uplink and downlinkcommunications between the parent DU and a child node of the parent DU.For example, in an aspect, the base station 102 and/or the communicationcomponent 242 may receive a signal, determine one or more NA resourcesbased on the child resource configuration, and/or performs other signalprocesses such as described above in FIG. 2 .

In some aspects, the communicating component 242, e.g., in conjunctionwith processor(s) 212, memory 216, and/or transceiver 202 may beconfigured to refraining, by the parent DU, from communicating with thechild node within the NA resources based on the indication of NAresources of the parent DU.

In some aspects, the communicating component 242, e.g., in conjunctionwith processor(s) 212, memory 216, and/or transceiver 202 configured toreceiving the child resource configuration includes receiving via anF1-application protocol (AP) interface.

In some aspects, the communicating component 242, e.g., in conjunctionwith processor(s) 212, memory 216, and/or transceiver 202 may beconfigured to determining the invalid TDD-uplink-downlink configurationbased on determining that a symbol sum of a first number of indicateddownlink symbols and a second number of indicated uplink symbols of aslot configuration are greater than a symbol number threshold.

In some aspects, the indication of NA resources corresponds to a secondTDD-uplink-downlink configuration, and further comprising determiningthe invalid TDD-uplink-downlink configuration based on determiningwhether the second TDD-uplink-downlink configuration complies with afirst TDD-uplink-downlink configuration; and identifying the invalidTDD-uplink-downlink configuration based on a determination that thesecond TDD-uplink-downlink configuration does not comply with the firstTDD-uplink-downlink configuration.

In some aspects, the first TDD-uplink-downlink configuration comprises aTDD common configuration for a slot, and wherein the secondTDD-uplink-downlink configuration corresponds to a TDD-uplink-downlinkdedicated configuration of the child-node for the slot.

FIG. 9 illustrates a flow chart of an example of a method 900 forwireless communication at a node, which may be an IAB node, and morespecifically, resource allocation in an IAB system. In an example, abase station 102 can perform the functions described in method 900 usingone or more of the components described in FIGS. 1, 2, 4, 5, and 10 .

At block 902, the method 900 may determine, by a CU, a child resourceconfiguration for a child node including an indication of NA resources,wherein the NA resources correspond to a set of one or more resourcesconfigured at a parent DU as being unavailable for uplink and downlinkcommunications between the parent DU and the child node of the parentDU. In an aspect, the communicating component 242, e.g., in conjunctionwith processor(s) 212, memory 216, and/or transceiver 202, may beconfigured to determine, by a CU, a child resource configuration for achild node including an indication of NA resources, wherein the NAresources correspond to a set of one or more resources configured at aparent DU as being unavailable for uplink and downlink communicationsbetween the parent DU and the child node of the parent DU. Thus, thebase station 102, the processor(s) 212, the communicating component 242or one of its subcomponents may define the means for determining, by aCU, a child resource configuration for a child node including anindication of NA resources, wherein the NA resources correspond to a setof one or more resources configured at a parent DU as being unavailablefor uplink and downlink communications between the parent DU and thechild node of the parent DU. For example, in an aspect, the base station102 and/or the communication component 242 may receive a signal,determine a child resource configuration for a child node, and/orperforms other signal processes such as described above in FIG. 2 .

At block 904, the method 900 may send, by the CU to the parent DU, thechild resource configuration including the indication of the NAresources via an invalid TDD-uplink-downlink configuration. In anaspect, the communicating component 242, e.g., in conjunction withprocessor(s) 212, memory 216, and/or transceiver 202, may be configuredto send, by the CU to the parent DU, the child resource configurationincluding the indication of the NA resources via an invalidTDD-uplink-downlink configuration. Thus, the base station 102, theprocessor(s) 212, the communicating component 242 or one of itssubcomponents may define the means for sending, by the CU to the parentDU, the child resource configuration including the indication of the NAresources via an invalid TDD-uplink-downlink configuration. For example,in an aspect, the base station 102 and/or the communication component242 may process a signal into an indication, transmit the child resourceconfiguration, and/or performs other signal processes such as describedabove in FIG. 2 .

In some aspects, the communicating component 242, e.g., in conjunctionwith processor(s) 212, memory 216, and/or transceiver 202 may beconfigured to sending the child resource configuration includes sendingvia an F1-AP interface.

In some aspects, the communicating component 242, e.g., in conjunctionwith processor(s) 212, memory 216, and/or transceiver 202 may beconfigured to determining the child resource configuration for the childnode includes creating an invalid slot configuration for one or moreslots unavailable for the parent DU to communicate with the child node.

In some aspects, the NA DU-child resources correspond to a slot.

FIG. 10 is a block diagram of a MIMO communication system 1000 includinga base station 102, which may be acting as an IAB node or a parent node,and a UE 104. The MIMO communication system 1000 may illustrate aspectsof the wireless communication access network 100 described withreference to FIG. 1 . The base station 102 may be an example of aspectsof the base station 102 described with reference to FIG. 1 . The basestation 102 may be equipped with antennas 1034 and 1035, and the UE 104may be equipped with antennas 1052 and 1053. In the MIMO communicationsystem 1000, the base station 102 may be able to send data over multiplecommunication links at the same time. Each communication link may becalled a “layer” and the “rank” of the communication link may indicatethe number of layers used for communication. For example, in a 2×2 MIMOcommunication system where base station 102 transmits two “layers,” therank of the communication link between the base station 102 and the UE104 is two.

At the base station 102, a transmit (Tx) processor 1020 may receive datafrom a data source. The transmit processor 1020 may process the data.The transmit processor 1020 may also generate control symbols orreference symbols. A transmit MIMO processor 1030 may perform spatialprocessing (e.g., precoding) on data symbols, control symbols, orreference symbols, if applicable, and may provide output symbol streamsto the transmit modulator/demodulators 1032 and 1033. Eachmodulator/demodulator 1032 through 1033 may process a respective outputsymbol stream (e.g., for OFDM, etc.) to obtain an output sample stream.Each modulator/demodulator 1032 through 1033 may further process (e.g.,convert to analog, amplify, filter, and upconvert) the output samplestream to obtain a DL signal. In one example, DL signals frommodulator/demodulators 1032 and 1033 may be transmitted via the antennas1034 and 1035, respectively.

The UE 104 may be an example of aspects of the UEs 104 described withreference to FIGS. 1 and 2 . At the UE 104, the UE antennas 1052 and1053 may receive the DL signals from the base station 102 and mayprovide the received signals to the modulator/demodulators 1054 and1055, respectively. Each modulator/demodulator 1054 through 1055 maycondition (e.g., filter, amplify, downconvert, and digitize) arespective received signal to obtain input samples. Eachmodulator/demodulator 1054 through 1055 may further process the inputsamples (e.g., for OFDM, etc.) to obtain received symbols. A MIMOdetector 1056 may obtain received symbols from themodulator/demodulators 1054 and 1055, perform MIMO detection on thereceived symbols, if applicable, and provide detected symbols. A receive(Rx) processor 1058 may process (e.g., demodulate, deinterleave, anddecode) the detected symbols, providing decoded data for the UE 104 to adata output, and provide decoded control information to a processor1080, or memory 1082.

The processor 1080 may in some cases execute stored instructions toinstantiate a communicating component 242 (see e.g., FIGS. 1 and 2 ).

On the uplink (UL), at the UE 104, a transmit processor 1064 may receiveand process data from a data source. The transmit processor 1064 mayalso generate reference symbols for a reference signal. The symbols fromthe transmit processor 1064 may be precoded by a transmit MIMO processor1066 if applicable, further processed by the modulator/demodulators 1054and 1055 (e.g., for SC-FDMA, etc.), and be transmitted to the basestation 102 in accordance with the communication parameters receivedfrom the base station 102. At the base station 102, the UL signals fromthe UE 104 may be received by the antennas 1034 and 1035, processed bythe modulator/demodulators 1032 and 1033, detected by a MIMO detector1036 if applicable, and further processed by a receive processor 1038.The receive processor 1038 may provide decoded data to a data output andto the processor 1040 or memory 1042.

The components of the UE 104 may, individually or collectively, beimplemented with one or more ASICs adapted to perform some or all of theapplicable functions in hardware. Each of the noted modules may be ameans for performing one or more functions related to operation of theMIMO communication system 1000. Similarly, the components of the basestation 102 may, individually or collectively, be implemented with oneor more ASICs adapted to perform some or all of the applicable functionsin hardware. Each of the noted components may be a means for performingone or more functions related to operation of the MIMO communicationsystem 1000.

Some Further Example Clauses

Implementation examples are described in the following numbered clauses:

1. A method of wireless communication, comprising:

receiving, by a wireless node, an indication of not-available (NA)resources of a parent node, the NA resources corresponding to a firstset of one or more resources configured at the parent node as beingunavailable for uplink and downlink communications between the parentnode and the wireless node, wherein the indication of NA resources ofthe parent node comprises an invalid time division duplex(TDD)-uplink-downlink configuration; and

refraining, by the wireless node, from communicating with the parentnode within the NA resources based on the indication of NA resources ofthe parent node.

2. The method of any preceding clause, wherein refraining fromcommunicating with the parent node within NA resources furthercomprises:

determining, by the wireless node, a second set of one or more resourcesdifferent from the first set, based on the indication of the NAresources of the parent node; and

communicating, between the wireless node and the parent node, using thesecond set of one or more resources.

3. The method of any preceding clause, wherein the second set of one ormore resources is in a different slot than the first set of one or moreresources.

4. The method of any preceding clause, further comprising determiningthe invalid TDD-uplink-downlink configuration by:

determining that a symbol sum of a first number of indicated downlinksymbols and a second number of indicated uplink symbols of a slotconfiguration is greater than a symbol number threshold; and

inferring the invalid TDD-uplink-downlink configuration based on thesymbol sum of the slot configuration being greater than the symbolnumber threshold.

5. The method of any preceding clause, further comprising determiningthe invalid uplink-downlink TDD configuration by identifying an invaliddownlink/uplink/flexible (D/U/F) slot configuration.

6. The method of any preceding clause, wherein the indication of NAresources of the parent node corresponds to a second TDD-uplink-downlinkconfiguration, and further comprising:

determining the invalid TDD-uplink-downlink configuration by:

-   -   determining whether the second TDD-uplink-downlink configuration        complies with a first TDD-uplink-downlink configuration received        prior to the second TDD-uplink-downlink configuration; and    -   identifying the invalid TDD-uplink-downlink configuration based        on a determination that the second TDD-uplink-downlink        configuration does not comply with the first TDD-uplink-downlink        configuration.

7. The method of any preceding clause, wherein the firstTDD-uplink-downlink configuration comprises a TDD common configurationfor a slot, and wherein the second TDD-uplink-downlink configurationcomprises a TDD-uplink-downlink dedicated configuration for the slot.

8. The method of any preceding clause, wherein the wireless nodecorresponds to at least one of a mobile termination (MT) entity of anintegrated access and back (IAB) node or a user equipment (UE).

9. The method of any preceding clause, wherein receiving the indicationof the NA resources of the parent node include receiving, by thewireless node from at least one of a parent distributed unit (DU) or acentral unit (CU), the indication of the NA resources of the parentnode.

10. A method of wireless communication, comprising:

determining, by a network node, whether one or more resources correspondto not-available (NA) resources of the network node, the NA resourcescorresponding to a first set of one or more resources configured at thenetwork node as being unavailable for uplink and downlink communicationsbetween the network node and the wireless node, wherein the indicationof NA resources of the network node comprises an invalid time divisionduplex (TDD)-uplink-downlink configuration; and

transmitting, by the network node to the wireless node, an indication ofNA resources of the network node, wherein the indication is configuredto trigger the wireless node to refrain from communication with thenetwork node within the NA resources of the network node.

11. The method of any preceding clause, wherein the network nodecorresponds to at least one of central unit (CU) or a distributed unit(DU).

12. The method of any preceding clause, wherein the wireless nodecorresponds to at least one of a mobile termination (MT) entity or auser equipment (UE).

13. The method of any preceding clause, wherein the indication of NAresources of the parent DU corresponds to a second TDD-uplink-downlinkconfiguration received after a first TDD-uplink-downlink configuration,and wherein the invalid TDD-uplink-downlink configuration corresponds tothe second TDD-uplink-downlink configuration failing to comply with thefirst TDD-uplink-downlink configuration.

14. The method of any preceding clause, wherein the firstTDD-uplink-downlink configuration comprises a TDD configuration for aslot provided as part of IAB-DU resource allocation, and wherein thesecond TDD-uplink-downlink configuration comprises a TDD-uplink-downlinkdedicated configuration for the slot.

15. The method of any preceding clause, wherein the firstTDD-uplink-downlink configuration comprises a TDD common configurationfor a slot, and wherein the second TDD-uplink-downlink configurationcomprises a TDD-uplink-downlink dedicated configuration for the slot.

16. An apparatus for wireless communication, comprising:

a transceiver;

a memory configured to store instructions; and

one or more processors communicatively coupled with the transceiver andthe memory, wherein the one or more processors are configured to executethe instructions to:

-   -   receive, by a wireless node, an indication of not-available (NA)        resources of a parent node, the NA resources corresponding to a        first set of one or more resources configured at the parent node        as being unavailable for uplink and downlink communications        between the parent node and the wireless node, wherein the        indication of NA resources of the parent node comprises an        invalid time division duplex (TDD)-uplink-downlink        configuration; and    -   refrain, by the wireless node, from communicating with the        parent node within the NA resources based on the indication of        NA resources of the parent node.

17. The apparatus of any preceding clause, wherein refraining fromcommunicating with the parent node within NA resources furthercomprises:

determining, by the wireless node, a second set of one or more resourcesdifferent from the first set, based on the indication of the NAresources of the parent node; and

communicating, between the wireless node and the parent node, using thesecond set of one or more resources.

18. The apparatus of any preceding clause, wherein the second set of oneor more resources is in a different slot than the first set of one ormore resources.

19. The apparatus of any preceding clause, further comprisingdetermining the invalid TDD-uplink-downlink configuration by:

determining that a symbol sum of a first number of indicated downlinksymbols and a second number of indicated uplink symbols of a slotconfiguration is greater than a symbol number threshold; and

inferring the invalid TDD-uplink-downlink configuration based on thesymbol sum of the slot configuration being greater than the symbolnumber threshold.

20. The apparatus of any preceding clause, further comprisingdetermining the invalid uplink-downlink TDD configuration by identifyingan invalid downlink/uplink/flexible (D/U/F) slot configuration.

21. The apparatus of any preceding clause, wherein the indication of NAresources of the parent node corresponds to a second TDD-uplink-downlinkconfiguration, and further comprising:

determining the invalid TDD-uplink-downlink configuration by:

-   -   determining whether the second TDD-uplink-downlink configuration        complies with a first TDD-uplink-downlink configuration received        prior to the second TDD-uplink-downlink configuration; and    -   identifying the invalid TDD-uplink-downlink configuration based        on a determination that the second TDD-uplink-downlink        configuration does not comply with the first TDD-uplink-downlink        configuration.

22. The apparatus of any preceding clause, wherein the firstTDD-uplink-downlink configuration comprises a TDD common configurationfor a slot, and wherein the second TDD-uplink-downlink configurationcomprises a TDD-uplink-downlink dedicated configuration for the slot.

23. The apparatus of any preceding clause, wherein the wireless nodecorresponds to at least one of a mobile termination (MT) entity of anintegrated access and back (IAB) node or a user equipment (UE).

24. The apparatus of any preceding clause, wherein receiving theindication of the NA resources of the parent node include receiving, bythe wireless node from at least one of a parent distributed unit (DU) ora central unit (CU), the indication of the NA resources of the parentnode.

25. An apparatus for wireless communication, comprising:

a transceiver;

a memory configured to store instructions; and

one or more processors communicatively coupled with the transceiver andthe memory, wherein the one or more processors are configured to executethe instructions to:

-   -   determine, by a network node, whether one or more resources        correspond to not-available (NA) resources of the network node,        the NA resources corresponding to a first set of one or more        resources configured at the network node as being unavailable        for uplink and downlink communications between the network node        and the wireless node, wherein the indication of NA resources of        the network node comprises an invalid time division duplex        (TDD)-uplink-downlink configuration; and    -   transmit, by the network node to the wireless node, an        indication of NA resources of the network node, wherein the        indication is configured to trigger the wireless node to refrain        from communication with the network node within the NA resources        of the network node.

26. The apparatus of any preceding clause, wherein the network nodecorresponds to at least one of central unit (CU) or a distributed unit(DU).

27. The apparatus of any preceding clause, wherein the wireless nodecorresponds to at least one of a mobile termination (MT) entity or auser equipment (UE).

28. The apparatus of any preceding clause, wherein the indication of NAresources of the parent DU corresponds to a second TDD-uplink-downlinkconfiguration received after a first TDD-uplink-downlink configuration,and wherein the invalid TDD-uplink-downlink configuration corresponds tothe second TDD-uplink-downlink configuration failing to comply with thefirst TDD-uplink-downlink configuration.

29. The apparatus of any preceding clause, wherein the firstTDD-uplink-downlink configuration comprises a TDD configuration for aslot provided as part of IAB-DU resource allocation, and wherein thesecond TDD-uplink-downlink configuration comprises a TDD-uplink-downlinkdedicated configuration for the slot.

30. The apparatus of any preceding clause, wherein the firstTDD-uplink-downlink configuration comprises a TDD common configurationfor a slot, and wherein the second TDD-uplink-downlink configurationcomprises a TDD-uplink-downlink dedicated configuration for the slot.

The above detailed description set forth above in connection with theappended drawings describes examples and does not represent the onlyexamples that may be implemented or that are within the scope of theclaims. The term “example,” when used in this description, means“serving as an example, instance, or illustration,” and not “preferred”or “advantageous over other examples.” The detailed description includesspecific details for the purpose of providing an understanding of thedescribed techniques. These techniques, however, may be practicedwithout these specific details. In some instances, well-known structuresand apparatuses are shown in block diagram form in order to avoidobscuring the concepts of the described examples.

Information and signals may be represented using any of a variety ofdifferent technologies and techniques. For example, data, instructions,commands, information, signals, bits, symbols, and chips that may bereferenced throughout the above description may be represented byvoltages, currents, electromagnetic waves, magnetic fields or particles,optical fields or particles, computer-executable code or instructionsstored on a computer-readable medium, or any combination thereof.

The various illustrative blocks and components described in connectionwith the disclosure herein may be implemented or performed with aspecially-programmed device, such as but not limited to a processor, adigital signal processor (DSP), an ASIC, a field programmable gate array(FPGA) or other programmable logic device, a discrete gate or transistorlogic, a discrete hardware component, or any combination thereofdesigned to perform the functions described herein. Aspecially-programmed processor may be a microprocessor, but in thealternative, the processor may be any conventional processor,controller, microcontroller, or state machine. A specially-programmedprocessor may also be implemented as a combination of computing devices,e.g., a combination of a DSP and a microprocessor, multiplemicroprocessors, one or more microprocessors in conjunction with a DSPcore, or any other such configuration.

The functions described herein may be implemented in hardware, software,or any combination thereof. If implemented in software executed by aprocessor, the functions may be stored on or transmitted over as one ormore instructions or code on a non-transitory computer-readable medium.Other examples and implementations are within the scope and spirit ofthe disclosure and appended claims. For example, due to the nature ofsoftware, functions described above can be implemented using softwareexecuted by a specially programmed processor, hardware, hardwiring, orcombinations of any of these. Features implementing functions may alsobe physically located at various positions, including being distributedsuch that portions of functions are implemented at different physicallocations. Moreover, the term “or” is intended to mean an inclusive “or”rather than an exclusive “or.” That is, unless specified otherwise, orclear from the context, the phrase, for example, “X employs A or B” isintended to mean any of the natural inclusive permutations. That is, forexample the phrase “X employs A or B” is satisfied by any of thefollowing instances: X employs A; X employs B; or X employs both A andB. Also, as used herein, including in the claims, “or” as used in a listof items prefaced by “at least one of” indicates a disjunctive list suchthat, for example, a list of “at least one of A, B, or C” means A or Bor C or AB or AC or BC or ABC (A and B and C).

Computer-readable media includes both computer storage media andcommunication media including any medium that facilitates transfer of acomputer program from one place to another. A storage medium may be anyavailable medium that can be accessed by a general purpose or specialpurpose computer. By way of example, and not limitation,computer-readable media can comprise RAM, ROM, EEPROM, CD-ROM or otheroptical disk storage, magnetic disk storage or other magnetic storagedevices, or any other medium that can be used to carry or store desiredprogram code means in the form of instructions or data structures andthat can be accessed by a general-purpose or special-purpose computer,or a general-purpose or special-purpose processor. Also, any connectionis properly termed a computer-readable medium. For example, if thesoftware is transmitted from a web site, server, or other remote sourceusing a coaxial cable, fiber optic cable, twisted pair, digitalsubscriber line (DSL), or wireless technologies such as infrared, radio,and microwave, then the coaxial cable, fiber optic cable, twisted pair,DSL, or wireless technologies such as infrared, radio, and microwave areincluded in the definition of medium. Disk and disc, as used herein,include compact disc (CD), laser disc, optical disc, digital versatiledisc (DVD), floppy disk and Blu-ray disc where disks usually reproducedata magnetically, while discs reproduce data optically with lasers.Combinations of the above are also included within the scope ofcomputer-readable media.

The previous description of the disclosure is provided to enable aperson skilled in the art to make or use the disclosure. Variousmodifications to the disclosure will be readily apparent to thoseskilled in the art, and the common principles defined herein may beapplied to other variations without departing from the spirit or scopeof the disclosure. Furthermore, although elements of the describedaspects and/or embodiments may be described or claimed in the singular,the plural is contemplated unless limitation to the singular isexplicitly stated. Additionally, all or a portion of any aspect and/orembodiment may be utilized with all or a portion of any other aspectand/or embodiment, unless stated otherwise. Thus, the disclosure is notto be limited to the examples and designs described herein but is to beaccorded the widest scope consistent with the principles and novelfeatures disclosed herein.

What is claimed is:
 1. A method of wireless communication, comprising: receiving, by a wireless node, an indication of not-available (NA) resources of a parent node, the NA resources corresponding to a first set of one or more resources configured at the parent node as being unavailable for uplink and downlink communications between the parent node and the wireless node, wherein the indication of NA resources of the parent node comprises an invalid time division duplex (TDD)-uplink-downlink configuration; and refraining, by the wireless node, from communicating with the parent node within the NA resources based on the indication of NA resources of the parent node.
 2. The method of claim 1, wherein refraining from communicating with the parent node within the NA resources further comprises: determining, by the wireless node, a second set of one or more resources different from the first set, based on the indication of the NA resources of the parent node; and communicating, between the wireless node and the parent node, using the second set of one or more resources.
 3. The method of claim 2, wherein the second set of one or more resources is in a different slot than the first set of one or more resources.
 4. The method of claim 1, further comprising determining the invalid TDD-uplink-downlink configuration by: determining that a symbol sum of a first number of indicated downlink symbols and a second number of indicated uplink symbols of a slot configuration is greater than a symbol number threshold; and inferring the invalid TDD-uplink-downlink configuration based on the symbol sum of the slot configuration being greater than the symbol number threshold.
 5. The method of claim 1, further comprising determining the invalid TDD-uplink-downlink configuration by identifying an invalid downlink/uplink/flexible (D/U/F) slot configuration.
 6. The method of claim 1, wherein the indication of NA resources of the parent node corresponds to a second TDD-uplink-downlink configuration, and further comprising: determining the invalid TDD-uplink-downlink configuration by: determining whether the second TDD-uplink-downlink configuration complies with a first TDD-uplink-downlink configuration received prior to the second TDD-uplink-downlink configuration; and identifying the invalid TDD-uplink-downlink configuration based on a determination that the second TDD-uplink-downlink configuration does not comply with the first TDD-uplink-downlink configuration.
 7. The method of claim 6, wherein the first TDD-uplink-downlink configuration comprises a TDD common configuration for a slot, and wherein the second TDD-uplink-downlink configuration comprises a TDD-uplink-downlink dedicated configuration for the slot.
 8. The method of claim 1, wherein the wireless node corresponds to at least one of a mobile termination (MT) entity of an integrated access and back (IAB) node or a user equipment (UE).
 9. The method of claim 1, wherein receiving the indication of the NA resources of the parent node includes receiving, by the wireless node from at least one of a parent distributed unit (DU) or a central unit (CU), the indication of the NA resources of the parent node.
 10. A method of wireless communication, comprising: determining, by a network node, whether one or more resources correspond to not-available (NA) resources of the network node, the NA resources corresponding to a first set of one or more resources configured at the network node as being unavailable for uplink and downlink communications between the network node and a wireless node, wherein an indication of NA resources of the network node comprises an invalid time division duplex (TDD)-uplink-downlink configuration; and transmitting, by the network node to the wireless node, the indication of NA resources of the network node, wherein the indication is configured to trigger the wireless node to refrain from communication with the network node within the NA resources of the network node.
 11. The method of claim 10, wherein the network node corresponds to at least one of a central unit (CU) or a distributed unit (DU).
 12. The method of claim 10, wherein the wireless node corresponds to at least one of a mobile termination (MT) entity or a user equipment (UE).
 13. The method of claim 10, wherein the indication of NA resources of the network node corresponds to a second TDD-uplink-downlink configuration received after a first TDD-uplink-downlink configuration, and wherein the invalid TDD-uplink-downlink configuration corresponds to the second TDD-uplink-downlink configuration failing to comply with the first TDD-uplink-downlink configuration.
 14. The method of claim 13, wherein the first TDD-uplink-downlink configuration comprises a TDD configuration for a slot provided as part of IAB-DU resource allocation, and wherein the second TDD-uplink-downlink configuration comprises a TDD-uplink-downlink dedicated configuration for the slot.
 15. The method of claim 13, wherein the first TDD-uplink-downlink configuration comprises a TDD common configuration for a slot, and wherein the second TDD-uplink-downlink configuration comprises a TDD-uplink-downlink dedicated configuration for the slot.
 16. An apparatus for wireless communication, comprising: a transceiver; a memory configured to store instructions; and one or more processors communicatively coupled with the transceiver and the memory, wherein the one or more processors are configured to execute the instructions to: receive, by a wireless node, an indication of not-available (NA) resources of a parent node, the NA resources corresponding to a first set of one or more resources configured at the parent node as being unavailable for uplink and downlink communications between the parent node and the wireless node, wherein the indication of NA resources of the parent node comprises an invalid time division duplex (TDD)-uplink-downlink configuration; and refrain, by the wireless node, from communicating with the parent node within the NA resources based on the indication of NA resources of the parent node.
 17. The apparatus of claim 16, wherein refraining from communicating with the parent node within the NA resources further comprises: determining, by the wireless node, a second set of one or more resources different from the first set, based on the indication of the NA resources of the parent node; and communicating, between the wireless node and the parent node, using the second set of one or more resources.
 18. The apparatus of claim 17, wherein the second set of one or more resources is in a different slot than the first set of one or more resources.
 19. The apparatus of claim 16, further comprising determining the invalid TDD-uplink-downlink configuration by: determining that a symbol sum of a first number of indicated downlink symbols and a second number of indicated uplink symbols of a slot configuration is greater than a symbol number threshold; and inferring the invalid TDD-uplink-downlink configuration based on the symbol sum of the slot configuration being greater than the symbol number threshold.
 20. The apparatus of claim 16, further comprising determining the invalid TDD-uplink-downlink configuration by identifying an invalid downlink/uplink/flexible (D/U/F) slot configuration.
 21. The apparatus of claim 16, wherein the indication of NA resources of the parent node corresponds to a second TDD-uplink-downlink configuration, and further comprising: determining the invalid TDD-uplink-downlink configuration by: determining whether the second TDD-uplink-downlink configuration complies with a first TDD-uplink-downlink configuration received prior to the second TDD-uplink-downlink configuration; and identifying the invalid TDD-uplink-downlink configuration based on a determination that the second TDD-uplink-downlink configuration does not comply with the first TDD-uplink-downlink configuration.
 22. The apparatus of claim 21, wherein the first TDD-uplink-downlink configuration comprises a TDD common configuration for a slot, and wherein the second TDD-uplink-downlink configuration comprises a TDD-uplink-downlink dedicated configuration for the slot.
 23. The apparatus of claim 16, wherein the wireless node corresponds to at least one of a mobile termination (MT) entity of an integrated access and back (IAB) node or a user equipment (UE).
 24. The apparatus of claim 16, wherein receiving the indication of the NA resources of the parent node include receiving, by the wireless node from at least one of a parent distributed unit (DU) or a central unit (CU), the indication of the NA resources of the parent node.
 25. An apparatus for wireless communication, comprising: a transceiver; a memory configured to store instructions; and one or more processors communicatively coupled with the transceiver and the memory, wherein the one or more processors are configured to execute the instructions to: determine, by a network node, whether one or more resources correspond to not-available (NA) resources of the network node, the NA resources corresponding to a first set of one or more resources configured at the network node as being unavailable for uplink and downlink communications between the network node and a wireless node, wherein an indication of NA resources of the network node comprises an invalid time division duplex (TDD)-uplink-downlink configuration; and transmit, by the network node to the wireless node, the indication of NA resources of the network node, wherein the indication is configured to trigger the wireless node to refrain from communication with the network node within the NA resources of the network node.
 26. The apparatus of claim 25, wherein the network node corresponds to at least one of central unit (CU) or a distributed unit (DU).
 27. The apparatus of claim 25, wherein the wireless node corresponds to at least one of a mobile termination (MT) entity or a user equipment (UE).
 28. The apparatus of claim 25, wherein the indication of NA resources of the network node corresponds to a second TDD-uplink-downlink configuration received after a first TDD-uplink-downlink configuration, and wherein the invalid TDD-uplink-downlink configuration corresponds to the second TDD-uplink-downlink configuration failing to comply with the first TDD-uplink-downlink configuration.
 29. The apparatus of claim 28, wherein the first TDD-uplink-downlink configuration comprises a TDD configuration for a slot provided as part of IAB-DU resource allocation, and wherein the second TDD-uplink-downlink configuration comprises a TDD-uplink-downlink dedicated configuration for the slot.
 30. The apparatus of claim 28, wherein the first TDD-uplink-downlink configuration comprises a TDD common configuration for a slot, and wherein the second TDD-uplink-downlink configuration comprises a TDD-uplink-downlink dedicated configuration for the slot. 